Test t/02_main.t fails with DateTime-Locale 1.33

[jplesnik]

The test fails with error:

ok 10 - An object of class 'DateTime' isa 'DateTime'
not ok 11 - ->locale ok

#   Failed test '->locale ok'
#   at t/02_main.t line 67.
#          got: 'en-US'
#     expected: 'en-US-POSIX'

It is caused by newer DateTime-Locale-1.33:
1.33 2021-10-30

• Rebuilt all locale data with the data from CLDR 40.0.0. There are some notable data changes in CLDR 40.0.0.
• Data change: The root locale is now named "und", not "root".
• Data change: The "en-US-POSIX" locale has been removed from CLDR. If you load this locale you will now get the "en-US" locale.